fishing:
level 40 fish lobsters and sell raw on grand exchange (dont sell good cooked)
level 62 fish monkfish and sell on grand exchange
level 76 fish and sell sharks
This is a nice way if you have low combat. If your p2p fight Green Drags. You almoust 50k per trip if you keep bones and sell them.
Another p2p offer is to Fight Aviansies. They drop adamantite bars noted 4 very common.

Then if your f2p i suggest u fight cockroach soldiers. They drop rune scimi's rune kiteshields and also alot of law runes.